Copper Prices Are Rising: Should You Switch to Aluminum?

October 2026

Copper has always been the go-to conductor for wiring harnesses.

It offers good conductivity, flexibility, reliable connections, and works well across industrial equipment, appliances, automation systems and many other applications.

But copper is getting more expensive.

Copper prices exceeded $14,500 per metric ton in early 2026, driven by growing demand from AI data centers, electrification and power infrastructure.

So a practical question is becoming more common:

Should we replace copper with aluminum?

The answer isn’t that simple.

Copper vs. Aluminum: Price Isn’t Everything

Aluminum is lighter and generally less expensive by weight. That makes it attractive for large power cables and applications where weight matters.

But aluminum has lower electrical conductivity than copper. To carry the same current, a larger conductor may be required.

Copper, meanwhile, offers:

• Higher electrical conductivity
• Better flexibility
• Easier termination
• Good mechanical strength
• Excellent performance in compact harnesses

For small and medium-sized custom wiring harnesses, copper often remains the more practical choice.

The important question is not “Which metal is cheaper?”

It is:

“Which material gives the right balance of cost, performance and reliability?”

What About Tinned Copper?

There is another option that is often overlooked: tinned copper.

A thin layer of tin protects the copper strands from oxidation and improves corrosion resistance. This can be useful in:

• Industrial equipment
• Outdoor applications
• Marine equipment
• Appliances
• Power systems

Tinned copper can cost more than bare copper, but in a demanding environment, the additional protection may be worth it.

Interestingly, tin prices have also been affected by growing demand from electronics and AI infrastructure.

When Does Aluminum Make Sense?

Aluminum can be a good choice when weight and material cost are major concerns.

It is widely used in power distribution, renewable energy and larger electrical systems.

But switching to aluminum is not simply a matter of changing the conductor.

Engineers may need to consider:

• Larger wire size
• Different terminals
• Crimping requirements
• Corrosion protection
• Available installation space
• Long-term connection reliability

So a lower material price does not always mean a lower finished harness cost.

Look at the Whole Harness, Not Just the Copper

The real cost of a wiring harness includes much more than the conductor.

Conductor + terminals + connectors + insulation + assembly + testing + logistics

A change in conductor material can affect several of these at the same time.

That’s why material selection should be based on the total cost and performance of the harness, rather than today’s copper price alone.

How Should You Choose?

Before changing from copper to aluminum, consider five things:

Current: How much current does the harness carry?

Space: Can the design accommodate a larger conductor?

Movement: Does the harness need to flex or withstand repeated bending?

Environment: Will it face heat, moisture, chemicals or vibration?

Volume: Is it a small custom order or a high-volume production part?

For many industrial and appliance harnesses, copper will still be the better overall choice.

For larger power applications where weight and material cost are critical, aluminum may be worth considering.

The Bottom Line

Rising copper prices are a good reason to rethink conductor selection—but not necessarily to abandon copper.

The best material is not always the cheapest one.

It is the one that delivers the right combination of electrical performance, flexibility, durability, manufacturability and total cost.

In wire harness design, a few cents saved on the conductor can mean little if they create a much bigger problem somewhere else.